OFFSET
1,3
LINKS
Luc Rousseau, A C program that computes a(n)
Eric Weisstein's World of Mathematics, Hamiltonian Path
Eric Weisstein's World of Mathematics, Hypercube Graph
FORMULA
a(n) = A003043(n) / n!.
EXAMPLE
For n=2, the two Hamiltonian paths of the square that start at (0,0), i.e.,
(0,0) -->-- (1,0) (0,0) (1,0)
| | |
V and V ^
| | |
(0,1) --<-- (1,1) (0,1) -->-- (1,1),
only account for one, as one is obtained from the other by the x <-> y permutation; so a(2) = 1.
PROG
(C) See link.
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Luc Rousseau, May 24 2021
STATUS
approved